ITT Schaub Lorenz Germanium output stage, not amplifying..

[Disco Volante]

Will someone take a look at this little old Germanium output stage?
Got it as non-functional. Should have tried it first, measured, I realize now.
Anyway, the thing got a full recap (all are reversed, positive ground here). Found a broken trace (volume pot lead) and a botched volume pot.
Sound is very low and distorted. Thought it would be a really weird and very portable guitar amp if it would work... And the rest of the machine does FM and AM too!

Injecting about 18mV sine wave into point 315 (right after the vol. pot) gives me just about twice that on the output (4R7 3W dummy load), and that's it.
Any more than that gives me a nice rounded, asymmetric Germanium clipping..
There's about 50mV DC on the output (which I guess makes sense given the strange feedback arrangement?)
All voltages within range, 5V between the output transistors, 9V supply, 0.7V across D371. The variable R between the bases of the outputs is mounted on the heatsink.
Removed all of *four* transistors, they all check out OK on my cheapo transistor-tester.

I guess that leaves checking all resistors and finally the remaining caps for possible leakage/drift? Or am I missing something obvious?
What is the purpose of R335 (270R)?

Thanks, V!

 

[Disco Volante]

Oh, and thanks @gyraf for the Tek 465 dual-channel scope, and the Philips sig-gen from the 70's. Cleaned the contacts, now functional! Gotta love that old analog gear...